Chemistry Reference
In-Depth Information
2
D
3/2,5/2
2
F
0
5/2,7/2
2
S
1/2
2
P
0
1/2,3/2
ns
np
nd
nf
10.97
8
7
6
5
10.5
4
10.0
3
9.5
8.2
H
930.75
937.80
8.0
949.74
972.54
Electronic transitions:
Wavelength (λ) in units of angstrom
1
0
1
v
Wavenumber:
k
=
=
λ
c
FIGURE 3.12
Combined partial energy levels Grotrian diagram for the hydrogen atom.
(From Radzig, A.A. and Smirnov, B.M.,
Reference Data on Atomic, Molecules and Ions
,
Springer Series Chemical Physics, Vol. 31, Springer Verlag, Berlin, Germany, 1985.)
Ar
+
+
e
−
+
Ar
→
2
e
−
,
ε
thres
=
ion
=
15.76 eV.
Furthermore, in the case of electronegative gases, the electron may be captured and
a stable negative ion is produced, e.g., the
dissociative electron attachment
reaction
for oxygen molecule.
O
−
+
e
−
+
O
2
→
O,
ε
thres
∼
4eV
(
T
g
=
300 K
)
.
